Dave Smith Instruments Poly Evolver

In 2005 Dave Smith Instruments released their third Evolver - The Poly
Evolver. Their flagship instrument, it's a four-voice synthesizer
(essentially four complete Evolvers) with a 5-octave keyboard, pitch and
mod wheels, and a ton of knobs and switches in a clean, clear, easy-to-navigate layout. It
can be a four-voice poly synth, four mono synths (each with its own
sequencer), or any combination in between. The Evolver series resurrects some of the oscillator,
filter and other component technologies from the classic Sequential
Circuits Prophet-VS and Pro-One synths.
The Evolver was a huge hit the moment it appeared and
this is the super-hands-on-real-time-programmable-polyphonic version of
the little beast.

Each voice is a complete Evolver with four oscillators per voice: two
analog and two digital - it's a true analog/digital hybrid synth. The analog oscillators feature multiple classic waveforms plus pulse-width
modulation and hard sync, and they sound really nice and big. The digital oscillators feature FM synthesis,
Ring Modulation and 96 Prophet VS
wavetables plus 32 user wavetables (loaded via MIDI only). Each voice
also features two Curtis voltage-controlled analog low-pass filters
which are fully resonant and switchable for two- or four-pole operation,
two digital highpass filters and real analog VCAs. Modulation
capabilities are handled by four LFOs and three ADSR envelope generators
(for the filter, the amp, and one is user assignable). There are dedicated
onboard effects (feedback, delay, distortion, glide, etc.). One of its
best features is the MIDI-syncable 16-step 4-parameter analog-style
sequencer (with each patch having its own sequence) which really brings
things to life with evolving sounds. The LFOs, step
sequencer, and three separate delays can all be synced for massive,
rhythmic, time-based effects in stereo. A major unique feature of the
Evolver is its true stereo signal path. For each Evolver voice, the left
and right channels get their own independent analog oscillator, lowpass
filter, highpass filter, VCA and effects. This allows for pretty nice
stereo imaging effects.

The Poly Evolver essentially quadruples all those Evolver specs!
In Program mode, all four voices play the same sound. In Combo
mode, voices can be allocated however desired: stack all 4 for a huge
unison sound, split or layer the keyboard in any configuration, and/or
play one or all sequences at the same time. Each voice can also respond
to a different MIDI channel. Each voice has its own stereo output jacks
in addition to the mix output. Stereo audio input can be routed to
any or all of the voices, enabling parallel audio processing of external
stereo or mono signals. The output of one voice can be routed to the input
of another for interesting double-processing effects. And multiple Poly
Evolvers can be daisy-chained for increased polyphony!

Full of hundreds of jaw-dropping preset patches, the Poly Evolver offers
four times the punch of the original Evolver. The Poly Evolver finally
answered prayers for a truly hands-on, programmable synthesizer version of
the Evolver, and Dave Smith went all out on this one. The keyboard is
semi-weighted with velocity and aftertouch, the wood end caps and
overall design make for a great, classic look. The Pitch/Mod wheels are
back-lit. With 77 endless-turn knobs and 59 switches, pretty much all
parameters are within easy reach. There is a Poly Evolver Rack version of
this keyboard, but where is the fun in that? Unless, of course, you "Poly
Chain" one or more Poly Evolver Rack models to a master Poly Evolver
keyboard for tons more polyphony and Evolver madness!
The Poly Evolver would soon be followed up by the much less expensive Mono Evolver, a
monophonic keyboard version of the original Evolver.